TMC647055 There are CO observation stations in

There are CO2 observation stations in the remote islands of the open oceans, such as the Mauna Loa Observatory (Fig. 1). The remote sites have the advantage of representing the continental scale of reference levels of trace gases. For example, the observed CO2 variation at the MLO site is co-influenced by both the Eurasian and the North American continents (Buermann et al., 2007 and Lintner et al., 2006).